Three ideas,
1. A button in settings to allow other people alliance members in chat when you take a vehicle out of service for any reason and likewise when you place them back in service. Can serve as a roleplay feature.
2. A button in settings to allow players to have random vehicle breakdown either in station when dispatched or while in mid response to call from any distance challenging the player to dispatch another unit in its place. This can also be used as a roleplay feature. And if this call is requesting mutual aid the other alliance members can see an alliance vehicle breaking down. Plus the vehicle could also break down in return to station thus bringing a third idea into play.
3. A Tow Wrecker, When a vehicle breaks down a tow truck is dispatched to recover broke down vehicle. Also could be used for MVA's and whatnot.w